HoMedics Totalclean 5in1 Tower Air PurifierUV C light reduces the presence of bacteria and viruses 360 HEPA Type filtration removes up to 99% of airborne allergens as small as 0. 3 microns Optional ionizer releases negative ions into the purified air to help the purification process Pre filter captures large particles Small rooms 145. 7 ft 13. 5 m Changes the air in a 145. 7 ft 13. 5 m room 4. 8 times every hour Auto off timer: 2, 4, 8 or 12 hours Night light 3 speeds Aroma slot with 3 pads